Siemens SITRANS WFS300 User manual

SITRANS
Sensing Heads
SITRANS WFS300
Operating Instructions
03/2021
A5E32880243
-AC
Introduction
1
Safety notes
2
Description
3
Installing/mounting
4
Connecting
5
Commissioning
6
Service and maintenance
7
Diagnosing and
troubleshooting
8
Technical specifications
9
Dimension drawings
10
Appendix A
A
Product documentation and
support
B

Siemens AG
Digital Industries
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: A5E32880243
Ⓟ
04/2021 Subject to change
Copyright © Siemens AG 2021.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 3
Table of contents
1 Introduction ........................................................................................................................................... 5
1.1 The manual ......................................................................................................................... 5
2 Safety notes........................................................................................................................................... 6
2.1 General safety instructions................................................................................................... 6
2.2 Installation in hazardous areas ............................................................................................. 6
3 Description........................................................................................................................................... 10
3.1 SITRANS WFS300 ............................................................................................................... 10
3.2 Principle of operation......................................................................................................... 10
4 Installing/mounting ............................................................................................................................. 12
4.1 Sensing head..................................................................................................................... 12
4.1.1 Side mount........................................................................................................................ 12
4.1.2 Base mount ....................................................................................................................... 13
4.2 Sensing plate..................................................................................................................... 13
4.3 Viscous damper ................................................................................................................. 14
5 Connecting .......................................................................................................................................... 15
5.1 Unit without LVDT conditioner card.................................................................................... 15
5.2 Unit with sensing head mounted LVDT conditioner card ..................................................... 16
5.3 Unit with remote-located LVDT conditioner card................................................................. 19
6 Commissioning .................................................................................................................................... 23
6.1 Calibration......................................................................................................................... 23
6.2 LVDT Output...................................................................................................................... 24
6.3 Span test ........................................................................................................................... 25
6.4 Sensing head level test ...................................................................................................... 25
6.5 Integrator calibration ......................................................................................................... 26
6.6 Zero calibration ................................................................................................................. 26
6.7 Span calibration................................................................................................................. 26
7 Service and maintenance .................................................................................................................... 28
7.1 Maintenance ..................................................................................................................... 28
7.2 Spare parts ........................................................................................................................ 28
7.3 Inner gasket replacement................................................................................................... 29
8 Diagnosing and troubleshooting......................................................................................................... 30
8.1 Range springs .................................................................................................................... 30

Table of contents
SITRANS WFS300
4Operating Instructions, 03/2021, A5E32880243-AC
8.2 Troubleshooting ................................................................................................................ 31
8.3 Linearity ............................................................................................................................ 31
9 Technical specifications....................................................................................................................... 33
9.1 Performance...................................................................................................................... 33
9.2 Construction...................................................................................................................... 33
9.3 Input ................................................................................................................................. 34
9.4 Output .............................................................................................................................. 34
9.5 Operating conditions ......................................................................................................... 34
9.6 Approvals .......................................................................................................................... 35
10 Dimension drawings............................................................................................................................ 36
10.1 WFS300 side mount outline and mounting......................................................................... 36
10.2 WFS300 base mount outline and mounting........................................................................ 37
A Appendix A .......................................................................................................................................... 38
A.1 WFS300 part identification diagram ................................................................................... 38
B Product documentation and support .................................................................................................. 40
B.1 Product documentation ..................................................................................................... 40
B.2 Technical support .............................................................................................................. 41
Index.................................................................................................................................................... 42

SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 5
Introduction
1
Note
The SITRANS sensing head is to be used only in the manner outlined in this manual,
otherwise protection provided by equipment may be impaired.
•
It is your responsibility to read this manual before installing and starting up any
component of the weighing system to which the sensing head is being applied.
Note
For industrial use only
This product is intended for use in industrial areas. Operation of this equipment in a
residential area may cause interference to several frequency based communications.
1.1 The manual
This manual covers only sensing head installation, operation, and maintenance procedures.
Flowmeter and integrator instruction manuals are available for download from our web site:
Siemens weighing (http://www.siemens.com/weighing)
Follow these operating instructions for quick, trouble-free installation, and maximum
accuracy and reliability of your device.
We always welcome suggestions and comments about manual content, design, and
accessibility. Please direct your comments to:
Technical publications (pi-documentation-service.indus[email protected])

SITRANS WFS300
6Operating Instructions, 03/2021, A5E32880243-AC
Safety notes
2
2.1 General safety instructions
CAUTION
Correct, reliable operation of the product requires proper transport, storage, positioning and
assembly as well as careful operation and maintenance. Only qualified personnel should
install or operate this instrument.
Note
Alterations to the
product, including opening or improper repairs of the product, are not
permitted.
If this requirement is not observed, the CE mark and the manufacturer's warranty will expire.
2.2 Installation in hazardous areas
WARNING
Equipment used in hazardous areas must be Ex-approved and marked accordingly. It is
required that the special conditions for safe use provided in the manual and in the Ex
certificate are followed.

Safety notes
2.2 Installation in hazardous areas
SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 7
WFS300 nameplate
Note
The nameplate shown is a typical example. Please check the nameplate on your device for
your specific device configuration.
WARNING
Make sure the hazardous area approval is suitable for the environment in which the device
will be installed.
Instructions specific to hazardous area installations
(Reference European ATEX Directive 94/9/EC, Annex II, 1/0/6)
The following instructions apply to equipment covered by certificate number
FM13ATEX0032X, or certificate number FM14ATEX0027X, or both if neither certificate is
specified.
1. For use and assembly, refer to the main instructions.
2. The equipment is certified for use as Category 3G equipment per FM13ATEX0032X.
3. Per FM13ATEX0032X, the equipment may be used with flammable gases and vapors with
apparatus group IIA, IIB, and IIC, and temperature classes T1, T2, T3, T4, T5, and T6 in zone 2
hazardous locations.

Safety notes
2.2 Installation in hazardous areas
SITRANS WFS300
8Operating Instructions, 03/2021, A5E32880243-AC
4. The equipment is certified for use as Category 2D equipment per FM14ATEX0027X.
5. Per FM14ATEX0027X, the equipment has a degree of ingress protection of IP64 and a
temperature class of T70ºC and may be used with flammable, conductive dusts in zone 21
and 22 hazardous locations.
6. The equipment is certified for use in an ambient temperature range of -40ºC to +60ºC.
7. The equipment has not been assessed as a safety related device (as referred to by Directive
94/9/EC Annex II, clause 1.5).
8. Installation and inspection of the equipment shall be carried out by suitably trained
personnel in accordance with the applicable code of practice.
9. Repair of the equipment shall be carried out by suitably trained personnel in accordance
with the applicable code of practice.
10.Components to be incorporated into or used as replacements in the equipment shall be
fitted by suitably trained personnel in accordance with the manufacturer’s documentation.
11.Each certificate number has an ‘X’ suffix, which indicates that special conditions for safe use
apply. Those installing or inspecting the equipment must have access to the certificates.
12.If the equipment is likely to come into contact with aggressive substances, then it is the
responsibility of the user to take suitable precautions that prevent it from being adversely
affected, thus ensuring that the type of protection is not compromised.
–Aggressive substances:
for example, acidic liquids or gases that may attack metals, or solvents that may affect
polymeric materials.
–Suitable precautions:
for example, establishing from the material’s data sheet that it is resistant to specific
chemicals.
Special conditions for safe use
Certificate number FM13ATEX0032X
The ‘X’ suffix to certificate number FM13ATEX0032X relates to the following special
conditions for safe use:
•The enclosure is non-conducting and, under certain extreme conditions, may generate an
ignition-capable level of electrostatic charges. The user shall ensure that the equipment is
not installed in a location where it may be subjected to external conditions (such as high-
pressure steam) which might cause a build-up of electrostatic charges on non-conducting
surfaces. Additionally, cleaning of the equipment should be done only with a damp cloth.
•Indoor use only. Additionally, the user shall ensure that the equipment is not installed in a
location where it is continuously exposed to ultraviolet light.
Certificate number FM14ATEX0027X
The ‘X’ suffix to certificate number FM14ATEX0027X relates to the following special
conditions for safe use:
•The enclosure is non-conducting and, under certain extreme conditions, may generate an
ignition-capable level of electrostatic charges. The user shall ensure that the equipment is
not installed in a location where it may be subjected to external conditions (such as high-

Safety notes
2.2 Installation in hazardous areas
SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 9
pressure steam) which might cause a build-up of electrostatic charges on non-conducting
surfaces. Additionally, cleaning of the equipment should be done only with a damp cloth.
•Indoor use only. Additionally, the user shall ensure that the equipment is not installed in a
location where it is continuously exposed to ultraviolet light.
•Magnesium, titanium or zirconium may be used at the accessible surface of the
equipment. In the event of rare incidents, ignition sources due to impact and friction
sparks could occur. This shall be considered when the WFS300 is being installed in
locations that specifically require Equipment Protection Level Db.

SITRANS WFS300
10 Operating Instructions, 03/2021, A5E32880243-AC
Description
3
3.1 SITRANS WFS300
SITRANS WFS300 sensing head is an out-of-process sensing element used for continuous in-
line weighing of powdered or granular dry bulk solid materials. It is used with the 40 tph
versions of SITRANS WF330 (general purpose), WF340 (vertical material drop), and WF350
(aerated gravity conveyor) dry solids flowmeters.
3.2 Principle of operation
SITRANS sensing heads are used for continuous weighing of dry bulk solid materials. The
material is directed toward the sensing plate. The horizontal impact force of the material
deflects the sensing plate, displacing the core of the sensing head LVDT (linear variable
differential transformer). The LVDT produces an output signal which is proportional to
material flowrate. A viscous fluid damper prevents oscillation of the mechanism and provides
mechanical damping of pulsating material flow.

Description
3.2 Principle of operation
SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 11
①
Impact force
③
Moving beam travel
②
LVDT
④
Sensing plate

SITRANS WFS300
12 Operating Instructions, 03/2021, A5E32880243-AC
Installing/mounting
4
CAUTION
Installation shall be performed only by qualified personnel in accordance with local
governing regulations.
4.1 Sensing head
The WFS300 sensing head is available in two models: side mount and base mount. The base
mount version should be used if the flowmeter will be subjected to excessive vibration, for
flow rates below 1 t/h, or if handling product temperatures above 60 °C. The side mount
version is factory-installed on Siemens flowmeters designed for side mount sensing heads.
4.1.1 Side mount
1. With the flowmeter housing installed, remove the sensing head cover.
2. Loosen the four sensing head mounting bolts.
3. Place a spirit level on the flat top of the sensing head frame: adjust the level by rotating the
sensing head, and retighten the mounting bolts.
①
Mounting bolts
②
Spirit level

Installing/mounting
4.2 Sensing plate
SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 13
4.1.2 Base mount
1. With the flowmeter housing installed, mount the sensing head to a rigid support structure.
2. Remove the sensing head fiberglass cover. With the outer gasket in place, bolt the sensing
head to the housing.
3. Adjust the sensing head levelling hardware (provided) to establish level in both horizontal
planes.
Note
Ensure that the structure used to support the base mount sensing head is capable of
supporting the dynamic material impact forces as well as the static weight of the sensing
head.
①
Spirit level
③
Moving beam (machined surface)
②
Rigid support
④
Supporting/levelling bolts
4.2 Sensing plate
1. Open the flowmeter housing access door.
2. Remove the sensing head cover and insert the sensing plate shaft fully into the sensing head
shaft socket.
Note
Ensure that the slot in the end of the shaft mates
with the roll pin in the back of the
socket.
3. Tighten the set screw/hex screw to secure the sensing plate.

Installing/mounting
4.3 Viscous damper
SITRANS WFS300
14 Operating Instructions, 03/2021, A5E32880243-AC
①
Sensing plate
④
Slot
②
Sensing head
⑤
Roll pin
③
Shaft
⑥
Set screw or hex head screw
4.3 Viscous damper
1. Remove the two damper cover shipping screws. The damper cover will be held up by a
spring.
2. If necessary, top up the damper to near overflowing with the damping fluid supplied.
3. Store the damper cover shipping screws, remaining damper fluid, and filler bottle for future
use.
Note
The damper must be full and free of air bubbles, with the damper cover in the UP position,
during flowmeter operation.
①
Sensing head
④
Shipping screws
②
Damper
⑤
Damper cover
③
Filler bottle
⑥
Check that there are no bubbles

SITRANS WFS300
15 Operating Instructions, 03/2021, A5E32880243-AC
Connecting
5
5.1 Unit without LVDT conditioner card
* For Encapsulated LVDT (hazardous)
•YEL = WHITE
•BLU = ORANGE
•GRN = YELLOW
LVDT
(Non-hazardous)
Integrator
(LVDT connection)
①Green
⑨SIG-
②Black
No connection
③Yellow
⑧COM
④Blue
⑦EXC-
⑤Red
⑥EXC+
Note
Ground shield at Integrator only.

Connecting
5.2 Unit with sensing head mounted LVDT conditioner card
SITRANS WFS300
16 Operating Instructions, 03/2021, A5E32880243-AC
5.2 Unit with sensing head mounted LVDT conditioner card
Note
Not applicable to Hazardous-rated units.
LVDT to SF500 Integrator
LVDT to LVDT conditioner card connections are made by Siemens.
*Where separation between the integrator and LVDT conditioner exceeds 150 m (500 ft):
1. Remove the jumpers from SF500 terminals 11/12 and 13/14.
2. Run additional conductors:
–from SF500 terminal 12 to conditioner terminal block marked "Integrator EXC+"
–from SF500 terminal 13 to conditioner terminal block marked "Integrator EXC-"
For further connection information on specific LVDTs, consult Siemens.

Connecting
5.2 Unit with sensing head mounted LVDT conditioner card
SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 17
♦Shields are common, but not grounded to chassis. Run cable shields through SHLD terminals
and ground at Integrator only.
Note
Ensure that the connection between TB-2 and TB-17 is made.

Connecting
5.2 Unit with sensing head mounted LVDT conditioner card
SITRANS WFS300
18 Operating Instructions, 03/2021, A5E32880243-AC
LVDT to SIWAREX FTC
LVDT to LVDT conditioner card connections are made by Siemens.
♦Connect the shield to the spring clamp shielding element that is mounted below the FTC.
See FTC manual for details.

Connecting
5.3 Unit with remote-located LVDT conditioner card
SITRANS WFS300
Operating Instructions, 03/2021, A5E32880243-AC 19
5.3 Unit with remote-located LVDT conditioner card
LVDT to SF500 Integrator
*Where separation between the integrator and LVDT conditioner exceeds 150 m (500 ft):
1. Remove the jumpers from SF500 terminals 11/12 and 13/14
2. Run additional conductors:
–from SF500 terminal 12 to conditioner terminal block marked "Integrator EXC+"
–from SF500 terminal 13 to conditioner terminal block marked "Integrator EXC-"
For further connection information on specific LVDTs, consult Siemens.
** For Encapsulated LVDT (hazardous)
•
YEL = WHITE
•
BLU = ORANGE
•
BLU = ORANGE
•
GRN = YELLOW
•
BLK = Not connected

Connecting
5.3 Unit with remote-located LVDT conditioner card
SITRANS WFS300
20 Operating Instructions, 03/2021, A5E32880243-AC
***The LVDT can be installed in a hazardous area, but all other components must be in a
non-hazardous area.
♦Shields are common, but not grounded to chassis. Run cable shields through SHLD terminals
and ground at Integrator only.
Note
Ensure that the connection between TB-2 and TB-17 is made.
Note
Junction box included with hazardous-rated unit.